One Madison Residential Condominium Tower, 23rd Street, Manhattan, Flatiron District, New York City, New York, United States

Although much of the area nearby is included in various historic districts – such as the Ladies' Mile Historic District, Gramercy Park Historic District and Madison Square North Historic District – the location of One Madison is not, enabling the building to be constructed "as of right" with the transfer of air rights from the shorter buildings that surround the site.
When the building was originally announced, it was to be 47 stories and called The Saya; the name was changed to One Madison Park around the time that construction began in 2006 and then to One Madison after it was taken over by the Related Companies. The building as constructed has 60 stories. It features 360-degree views and contains 53 residential units, topped by an 6,850-square-foot triplex penthouse with a 586-square-foot wraparound terrace. The original asking price for the penthouse was $45 million, and was originally announced as including a butler with his own one-bedroom apartment on a lower floor. Prior to Related's take over of the building, the penthouse was under contract for $32 million, but that deal never closed.
As of April 2010, the building had topped out, but was still not complete, having run into financial difficulties. Sales of residential units had stopped, but the appointment of a receiver on April 15 allowed sales to start again. The building continued to be mired in financial and legal problems, including multiple lawsuits and allegations of fraud, and was forced into bankruptcy by some of its creditors in June 2010.
At one point, a 22-story building designed by noted architect Rem Koolhaas was to be the building's "companion" on 22nd Street, but later plans called for an 11-story building designed by Cetra/Ruddy, the firm that designed One Madison; although at the time construction began in January 2013, permits had reportedly been issued for a 6-story building, which will include the entrance lobby and two duplex apartments. The companion building, designed by BKSK Architects to feature a terra-cotta and glass façade, will be the primary entrance to the building.